A potentiometer has a resistance wire of...

A potentiometer has a resistance wire of 4 m length and resistance 4 `Omega`, a cell of emf 12 V is connected across the wire. if cells having emfs `E_1=2V` and `E_2=4V` and internal resistance `r_1=2` and `r_2=6Omega` are connected as shown in the figure, then null deflection on length AN, is

`1/6`

`5/3`

`3/2`

`4/5`

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